Did you always have ammonia out of the tap ? Looks like your bb took a big hit
Let's be clear. Was your neon also swimming erratically BEFORE the water change (is this what prompted you to do your initial 50% wc), or was the neon swimming fine until you did a water change and only then did it start struggling?
Did you always have ammonia out of the tap ? Looks like your bb took a big hit
Something had to cause the bb to crash. 0 nitrates is the problem. Pick up some tetra safestart
I'd immediately throw prime in the water and get FritzZyme TurboStart 700. I recommend this to everyone, it is refrigerated so it has more bb. It rebuilds bb stock in like a week.